From our personal collection is this: a great condition Nivada Grenchen Valjoux 23. Its case is in exceptional untouched condition and overall it is a superb example. Saving this watch was a great job, the movement is now in great condition and got the chance to save it by going all the way. Nothing was spared in bringing this lollipop chronograph back to life.
 
Make: Nivada Grenchen
Model: Chronomaster Aviator Sea Diver
Reference: --
Year: Circa 1960s
Material: Stainless Steel
Dimensions: 38mm
Crystal: Original Domed Plexi Glass
Movement: Manual Cal 23
Bracelet/Strap: Aftermarket Band
Lug Width:  20mm
Box/Papers: No